Christian Lawson-Perfect is a user on mathstodon.xyz. You can follow them or interact with them if you have an account anywhere in the fediverse. If you don't, you can sign up here.
Christian Lawson-Perfect @christianp

The letterboxes outside a block of flats near my house are arranged like so:

\[ \begin{matrix}
9&2&3&4 \\
5&6&7&8 \\
1&10&11&12
\end{matrix} \]

The occupants of flats 1 and 9 must be quite well-acquainted.

· Web · 0 · 0